Tips to use home page url, custom page url and pass query string in Magento CMS Page

{{store url=""}} -> Used to get Store's home page URL.
Resulting in a URL like "http://yourstore.com/"

{{store url="contacts"}} -> Used to get contact us page URL.
Resulting in a URL like "http://yourstore.com/contacts/"

If you want to show custom URL Use direct_url
{{store direct_url="category/subcategory.html"}} -> Used to get custom URL.
Resulting in a URL like "http://yourstore.com/category/subcategory.html"

If you want to pass parameters in query string use _query
{{store direct_url="category/subcategory.html" _query="a=param_a&b=param_b"}} -> Used to Pass query string
Resulting in a URL like "http://yourstore.com/category/subcategory.html?a=param_a&b=param_b"

{{skin url='images/homepageimage.jpg'}} -> Used to get image url